Not many manufacturers, nor reviewers speak about the transmission value of lenses. In the case of the 'Sigma 85mm f/1.4 DG HSM | A' it is intersting to know, because it might be very low -- somewhere close to its minimum aperture of 1.4, let's say 1.5 T-stops. This because of its humongous front element and overall size and weight, indicating that big glass is used to let in a lot of light. Anyone knows what is the transmission of the Sigma 85mm f/1.4 DG HSM | A in T-stops?